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GB 55031-2022 English PDF

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GB 55031-2022: (General Code for Civil Buildings)
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Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB 55031-2022	English	1499	Add to Cart	9 days [Need to translate]	(General Code for Civil Buildings)	Valid	GB 55031-2022

Standard similar to GB 55031-2022

GB 55033 GB 55030

Basic data

Standard ID	GB 55031-2022 (GB55031-2022)
Description (Translated English)	(General Code for Civil Buildings)
Sector / Industry	National Standard
Word Count Estimation	78,753
Date of Issue	2022-07-15
Date of Implementation	2023-03-01
Issuing agency(ies)	Ministry of Housing and Urban-Rural Development of the People's Republic of China; State Administration for Market Regulation

GB 55031-2022: (General Code for Civil Buildings)

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
1 General 1.0.1 This specification is formulated to standardize the basic dimensions, technical requirements and general technical measures of the spaces and parts of civil buildings. 1.0.2 Civil buildings must implement this code. 1.0.3 The construction, use and maintenance of civil buildings should follow the following basic principles. 1.In accordance with the principle of sustainable development, the relationship between people, buildings and the environment should be correctly handled, and a reasonable space matching the function of use should be constructed; 2 The policy requirements of energy saving, land saving, water saving, material saving and environmental protection shall be implemented; 3 It should be in harmony with the environment, reflecting the characteristics of the times and regional culture. 1.0.4 Whether the technical methods and measures adopted in the project construction meet the requirements of this specification shall be judged by the relevant responsible parties. Among them, innovative technical methods and measures should be demonstrated and meet the performance requirements in this specification.

2 Basic regulations

2.1 Functional requirements 2.1.1 The construction of civil buildings should follow the principles of safety, sanitation, health, and comfort, and provide reasonable use space for social activities such as people's life, work, and communication. The use space should meet the basic requirements of ergonomics. 2.1.2 The location of civil buildings should meet the safety requirements. 2.1.3 Residential buildings should guarantee the safety and privacy of the occupants, and should meet the requirements for lighting, ventilation and sound insulation. 2.1.4 Public buildings such as education, office research, commercial services, public activities, transportation, medical care, and social and people's livelihood services should not only meet the space and use requirements for various activities, but also meet the requirements for transportation and personnel gathering and distribution. 2.1.5 When there is a combination of different functional places in a civil building, in addition to meeting the requirements of the above clauses, the following regulations should also be met.

1 Each functional place shall not lower the basic safety and sanitation standards of other functional places

2 When the functional places that produce pollution and radiation are combined with other functional places, necessary safety protection measures shall be taken; 3 When functional places with different safety levels are combined, corresponding measures to ensure the safety of each functional place shall be taken. 2.1.6 Civil buildings should be equipped with equipment and facilities that meet the needs of basic functions. 2.1.7 Civil buildings should be equipped with corresponding safety and guidance marking systems. 2.2 Performance and measures 2.2.1 Civil buildings should comprehensively adopt disaster prevention safety measures such as fire prevention, earthquake resistance, flood prevention, air defense, wind and snow resistance and lightning protection. 2.2.2 The structure of civil buildings shall meet the corresponding design working life requirements. 2.2.3 Civil buildings should meet barrier-free requirements, and facilities with barrier-free performance should be systematically coherent. 2.2.4 The indoor and outdoor decoration should not affect the safety of the building structure, and the safe and environment-friendly decoration materials should be selected. The connection between decoration materials, decorative surfaces or components and the main structure should be safe and firm. Materials and structures such as decorative surfaces, components, doors and windows of the building's exterior walls should be safe and reliable, and should meet the functional and performance requirements within the design working life, and should be regularly maintained during use to prevent falling. 2.2.5 Prefabricated buildings should adopt integrated, modularized, standardized and generalized prefabricated parts and components. 2.2.6 The outdoor public places, building spaces, building components and public equipment and facilities of civil buildings shall be regularly maintained, repaired and supervised.

3 Building area and height

3.1 Construction area 3.1.1 The building area shall be calculated according to the horizontal projected area of the space enclosed by the outer surface of the outer enclosure structure at each natural floor (ground) of the building. 3.1.2 The total construction area shall be calculated according to the sum of the above-ground and underground construction areas, and the above-ground and underground construction areas shall be calculated separately. 3.1.3 For the building space above the outdoor design floor, its building area shall be included in the above-ground building area; for the building space below the outdoor design floor, its building area shall be included in the underground building area. 3.1.4 For the building space of permanent structure, if there is a permanent roof, the height of the structure or the top height of the inclined structural slab is 2.20m or above, the building area shall be calculated according to the following regulations. 1 For the building space with enclosure structure and closed enclosure, it shall be calculated according to the horizontal projected area of the space enclosed by the outer surface of the enclosure structure; 2 For the unenclosed building space without enclosure, enclosed by columns, or partially enclosed by columns and columns, the calculation shall be based on the horizontal projected area of the space enclosed by the columns or the outer surface of the enclosure; 3 For the building space without enclosure structure, single row of columns or independent columns, and not closed, it shall be calculated according to 1/2 of the horizontal projected area of the top cover; 4 The building space without enclosure structure, with enclosure facilities, without columns, attached to the building enclosure structure, and not enclosed, shall be calculated according to 1/2 of the horizontal projected area of the space enclosed by the outer surface of the enclosure facilities. 3.1.5 The construction area of the balcony shall be calculated according to 1/2 of the horizontal projected area of the space enclosed by the outer surface of the enclosure; when the balcony is closed, it shall be calculated according to the horizontal projected area of the space enclosed by the outer surface of its outer enclosure. 3.1.6 The following spaces and positions shall not be calculated for building area. 1 The building space where the height of the structural storey or the top height of the inclined structural slab is less than 2.20m; 2 The building space without roof; 3 Components (parts) attached to the building envelope; 4 The lower space of the overhanging part of the building; 5 The public transportation space in the building used for urban streets and alleys; 6 All kinds of structures independent of buildings. 3.1.7 The usable area of the functional space shall be calculated according to the horizontal projected area of the space enclosed by the inner surface of the wall of the functional space. 3.1.8 The usable area of a functional unit shall be calculated according to the sum of the usable areas of each functional space in the functional unit. 3.1.9 The building area of a functional unit shall be calculated according to the sum of the usable area of the functional unit, the horizontal projected area of the wall of the functional unit, and the area of the balcony in the functional unit. 3.2 Building height 3.2.1 The building height of a flat roof shall be calculated according to the height from the outdoor design floor to the apex of the parapet of the building, and the height of a building without a parapet shall be calculated according to the height from the apex of its roof cornice. 3.2.2 The height of the eaves and the ridge of the sloping roof shall be calculated separately. The height of the eaves shall be calculated according to the height from the outdoor design floor to the cornice or the lowest point of the sloping roof, and the height of the ridge shall be calculated according to the height from the outdoor design floor to the ridge. 3.2.3 When the same building has multiple roof forms, or multiple outdoor design floors, the building height shall be calculated separately and the maximum value shall be taken. 3.2.4 For the buildings in the technical operation control area of airports, radio and television, telecommunications, microwave communications, meteorological stations, satellite ground stations, military forts and other facilities and within the control range of airport routes, the building height should be in accordance with the outdoor design floor of the building to the building height. (Structure) calculation of the highest point of the building. 3.2.5 For historic buildings, buildings in the protection planning areas of famous historical and cultural cities, towns and villages, historical and cultural blocks, cultural relics protection units, scenic spots, and nature reserves, the building height shall be in accordance with the outdoor design floor to building (structure)) calculation of the highest point of the building. 3.2.6 For buildings other than those specified in Article 3.2.4 and Article 3.2.5 of this code, if the total area of roof equipment rooms and other partially protruding roof rooms does not exceed 1/4 of the roof area, it shall not be included in the construction high. 3.2.7 The indoor clear height of the building shall meet the minimum requirements for the clear height of various types of functional places, and the indoor clear height of the lowest place where there are normal activities of personnel such as the basement, partial mezzanine, public walkway, building refuge area, and overhead floor shall not be less than 2.00m.

4 Building Outdoor Site

4.1 Environment and site 4.1.1 Civil buildings should combine the characteristics of the local natural environment, make intensive use of resources, and strictly control their adverse impact on the ecological environment. 4.1.2 The air, soil and water in the surrounding environment of the building shall not pose a hazard to human health. Effective measures should be taken to control the polluted construction sites, and the soil environmental quality requirements for construction land should be met. 4.1.3 During the construction and use of buildings, measures to control noise, vibration, glare and other pollution should be taken, and the generated waste, waste gas, waste water and other pollutants should be properly disposed of. 4.1.4 The distance between buildings and hazardous chemicals, flammable and explosive materials and other hazards shall meet the relevant safety regulations. 4.1.5 The construction site shall meet the following requirements. 1 Reliable flood and waterlogging prevention measures should be taken for sites with flood threats; 2 When the elevation of the site is lower than that of the municipal road, there shall be measures to prevent passenger water from entering the site; 3 The design elevation of the site should be higher than the maximum groundwater level in all years. 4.1.6 The construction base of densely populated public buildings shall meet the following requirements. 1 The entrance and exit of the building base shall meet the requirements for safe evacuation of personnel; 2 A personnel gathering and distributing place should be set up in front of the main entrance and exit of the building, and its area, length and width should be determined according to the nature of use and the number of people; 3 The green space, parking lot (space) or other structures set up in the building base shall not cause obstacles to the gathering and dispersing of people. 4.2 Building Controls 4.2.1 Except for building connectors, subway-related facilities, pipelines, pipe trenches, pipe galleries and other municipal facilities, buildings and their auxiliary facilities should not highlight the red line of the road or the red line of the land. 4.2.2 Except for the entrances and exits of basements and underground garages, as well as window wells, steps, ramps, awnings, overhanging eaves and other facilities, the main body of the building (structure) should not protrude from the building control line. 4.2.3 Arcade buildings, building connectors, cantilevered buildings along the red line of the road, etc. shall not affect traffic, environmental protection and fire safety. 4.3 Base road 4.3.1 The road system in the construction base shall be smooth and convenient, ensure the traffic safety of vehicles and pedestrians, and shall meet the requirements of fire rescue and barrier-free passage. 4.3.2 The building base road should be connected with the external road. 4.3.3 A buffer section shall be set between the entrance and exit of the motor vehicle garage in the building base and the connecting road. 4.3.4 The location of motor vehicle entrances and exits on the construction base shall meet the following requirements. 1 It should not be directly connected to the urban expressway; 2 The distance from the nearest edge of the entrances and exits of surrounding primary and secondary schools and kindergartens should not be less than 20.0m 3 There should be a good line of sight, and there should be no obstacles blocking the line of sight within the driving line of sight. 4.3.5 The setting of roads in the building base shall meet the following requirements. 1 Speed-limiting facilities should be set up at the joints between roads in the base and urban roads, and the roads should be able to reach the main entrances and exits of buildings; 2 When the motor vehicle road changes direction, the roadside greening and buildings shall meet the requirements for the effective sight distance for driving. 4.3.6 Motor vehicle roads in the construction base shall meet the following requirements. 1 The width of a single lane shall not be less than 3.0m, and shall not be less than 4.0m when it doubles as a fire lane; 2 The width of the double lane should not be less than 6.0m 3 When the length of the end-type road is greater than 120m, a return field shall be provided. 4.4 Site Pavement and Water Body 4.4.1 Hard pavements such as sidewalks and squares in the site shall ensure the safety of personnel passing, and the surface of the pavement shall be non-slip. 4.4.2 The plaza where vehicles are allowed to pass shall meet the requirements for driving, parking and loading of vehicles, and the ground paving surface shall be flat, non-slip and wear-resistant. 4.4.3 When the water depth within 2.0m near the shore of the artificial water body is greater than 0.50m, safety protection measures shall be taken. 4.5 Structures and facilities 4.5.1 The polluting air outlets of underground garages and basements should not face the openable external windows or air intakes of adjacent buildings; when the distance between the air outlet and the personnel activity place is less than 10m, The height from the bottom to the floor of the personnel activity place should not be less than 2.5m. 4.5.2 When solar hot water or photovoltaic power generation systems, HVAC equipment, billboards, external sunshade facilities, decorative moldings and other auxiliary components or facilities are installed on buildings, safety protection measures to prevent components or facilities from falling should be taken, and The building structure and other corresponding safety requirements shall be met. 4.5.3 The domestic garbage collection station in the base shall meet the following requirements. 1 Water and sewage facilities should be configured, and the floor and walls should be made of easy-to-clean materials; 2.It should meet the requirements for classified storage of garbage; 3 A site that meets the loading and transportation requirements of garbage trucks should be set up.

5 General space of the building

5.1 Access 5.1.1 Building entrances and exits shall be set according to site conditions, building use functions, traffic organization and safety evacuation requirements, and shall be safe, smooth and convenient. 5.1.2 When floor-to-ceiling glass is used for personnel access parts such as entrances and halls, safety glass should be used, and anti-collision warning signs should be set up. 5.1.3 Measures shall be taken at the entrance and exit of the building to prevent outdoor rainwater from intruding into the room. 5.2 Steps, pedestrian ramps 5.2.1 When the total height of steps and pedestrian ramps reaches or exceeds 0.70m, protective measures shall be taken on the free surface. 5.2.2 The width of the outdoor steps at the main entrance of the building should not be less than 0.30m, and the height of the steps should not be greater than 0.15m. 5.2.3 The number of steps should not be less than 2 levels. If the number of steps is less than 2 levels, it should be set as a pedestrian ramp. 5.2.4 Anti-slip measures should be taken for the pavement surface of steps and pedestrian ramps. 5.3 Stairs, corridors 5.3.1 Stairs and corridors should be safe and smooth, and should meet the requirements of personnel passage and safe evacuation. 5.3.2 The minimum clear width of the steps of public stairs for daily traffic shall be determined according to the use characteristics of the building, according to the number of streams of people and the width of each stream of 0.55m, and shall not be less than the width of two streams of people. 5.3.3 When there is a handrail on one side of the public staircase, the clear width of the stair section shall be calculated according to the horizontal distance from the decorative surface of the wall to the center line of the handrail. When there are handrails on both sides of the public staircase, the net width of the steps shall be calculated according to the horizontal distance between the centerlines of the handrails on both sides. When there is a protrusion, the clear width of the stair section shall be calculated from the surface of the protrusion. The net distance between the edge of the handrail against the wall and the finished surface of the wall shall not be less than 40mm. 5.3.4 Handrails should be provided on at least one side of public stairs, and handrails should be provided on both sides when the clear width of the stair section reaches the width of 3 streams of people. 5.3.5 When the stairs change direction, the minimum width of the stair rest platform should not be less than the clear width of the stairs, and should not be less than 1.20m; when there is a solid wall in the middle, the clear width of the platform at the turning end of the handrail should not be less than 1.30m. The width of the middle platform of straight running stairs shall not be less than 0.90m. 5.3.6 The distance between the stairwell door and the step edge of the stairway facing (upward and downward) steps of the public staircase should not be less than 0.60m. 5.3.7 The clear height of the upper and lower aisles of the rest platform of public stairs shall not be less than 2.00m, and the clear height of the steps shall not be less than 2.20m. 5.3.8 The number of steps in each section of public stairs should not be less than 2 and should not exceed 18. 5.3.9 The minimum width and maximum height of public stair treads shall comply with the provisions in Table 5.3.9.The step width of spiral stairs and fan-shaped steps at a distance of 0.25m from the center of the inner handrail shall not be less than 0.22m. Table 5.3.9 Minimum Width and Maximum Height of Stair Steps (m) Note. The public buildings and non-residential residential buildings in the table do not include nurseries, kindergartens, primary and secondary schools and care facilities for the elderly. 5.3.10 The step height and width of each stair section should be consistent, the step height difference between adjacent stair sections should not be greater than 0.01m, and anti-slip measures should be taken on the step surface. 5.3.11 When the net width of the public stairwell in the children-only activity place is greater than 0.20m, measures to prevent children from falling should be taken. 5.3.12 Except for residential buildings, the clear width of public corridors in civil buildings shall meet the minimum clear width requirements of various types of functional places, and shall not be less than 1.30m. 5.4 Elevators, escalators, moving walks 5.4.1 The installation of elevators, escalators and moving walks shall meet the requirements for safe use. Civil buildings should be equipped with fire protection and barrier-free elevators in accordance with the requirements of relevant regulations. 5.4.2 The elevator setting should meet the following requirements. 1 The number of elevators in high-rise public buildings and high-rise non-residential residential buildings shall not be less than two 2 When there is an elevator in the building, at least one barrier-free elevator should be installed; 3 When the elevator shaft and machine room are arranged adjacent to rooms with quiet requirements, vibration and sound insulation measures should be taken 4 The elevator machine room should take measures such as heat insulation, ventilation, and dust prevention. The roof of the machine room should not be directly used as the bottom plate of the water tank, and water pipes or steam pipes should not directly pass through the machine room. 5.4.3 The setting of escalators and moving walks shall meet the following requirements. 1 The width of the unobstructed area at the entrance and exit shall not be less than 2.50m from the end of the handrail;

2 The escalator or moving walk in the atrium should take measures to prevent people from falling

3 Two ladders (roads) are adjacent to each other in parallel or cross, when the horizontal projected distance between the center line of the handrail and the parallel wall or the finished surface of the opening edge of the floor (beam), and the center line of the handrail between the two ladders (roads) When the horizontal distance is less than 0.50m, anti-clamping and anti-shearing protective facilities shall be installed within 1.00m in front of the sharp-angled opening or other measures shall be taken to prevent personnel from being injured by building obstacles; 4 The clear vertical height above the steps of the escalator, the pedals of the moving walk or the conveyor belt shall not be less than 2.30m. 5.5 Public Kitchen 5.5.1 Public kitchens shall comply with food hygiene and epidemic prevention safety and kitchen technology requirements. 5.5.2 Open drainage ditches should not be set up in the cleaning operation areas such as kitchen rooms and meal preparation areas, and floor drains should be able to prevent turbid air from escaping. 5.5.3 The kitchen area, food warehouse and other rooms shall take measures against rodents, insects and other animals, as well as measures against dust, moisture, peculiar smell and ventilation. 5.5.4 The public kitchen shall take measures to prevent oil fume, smell, noise and waste from polluting the adjacent buildings or space environment. 5.6 Public restrooms (toilets) 5.6.1 Civil buildings shall be equipped with public toilets (toilets) according to functional requirements, and shall be equipped with hand washing facilities. 5.6.2 The setting of public toilets (toilets) shall meet the following requirements. 1 The layout should be reasonable according to the building function, and the location and quantity should meet the requirements of use 2 It should not be arranged on the immediate upper floor of rooms with strict sanitation and safety requirements; 3 Sanitary ware and its use space should be reasonably arranged according to the space occupied by human activities, and the pipelines should be relatively concentrated for easy replacement and maintenance. 5.6.3 The ratio of male and female toilet seats in public toilets (toilets) should be determined according to the characteristics of use and the number of users. 5.6.4 The planar net size of the public toilet (toilet) compartment shall be reasonably determined according to the characteristics of use, and shall not be less than the specified value in Table 5.6.4. Table 5.6.4 Planar minimum net dimensions of public toilet (toilet) compartments 5.6.5 The clear width of the channel in the public toilet shall meet the following requirements. 1 When the door of the toilet compartment is opened, the clear width of the channel outside the single-row toilet compartment shall not be less than 1.30m; the clear width of the channel between the double-row toilet compartments shall not be less than 1.30m; The clear width of the channel should not be less than 1.30m; 2 When the door is opened in the toilet compartment, the clear width of the passage shall not be less than 1.10m. 5.7 Nursing room 5.7.1 Maternal and infant rooms should be set up in public buildings where mothers and infants often stay. 5.7.2 In public buildings, the location, quantity, area and configuration facilities of mother and baby rooms should be reasonably determined according to factors such as the area of public places, the flow of people, and the stay of mothers and babies. 5.8 Equipment room 5.8.1 Buildings should be equipped with gas, heat, water supply and drainage, ventilation, air conditioning, electricity, communication and other equipment rooms according to the needs of normal operation. The equipment rooms should meet the requirements of safety, fire prevention, sound insulation, noise reduction, vibration reduction, waterproof and other requirements. 5.8.2 The floor height and vertical transportation traffic of equipment room and equipment floor shall meet the requirements of equipment load, installation and maintenance, and there shall be an entrance, exit and maintenance channel that can meet the maximum equipment installation and maintenance. 5.8.3 The equipment room shall take effective measures to prevent it from polluting other public areas, adjacent buildings or the environment. 5.9 Basement and semi-basement 5.9.1 The entrances (ramps), window wells, air wells, sunken courtyards (sunken squares), underground pipelines (ditches), underground wells, etc. of the basement and semi-basement shall take necessary measures for water interception, water retention and protection. Drainage and other measures to prevent water gushing and reverse irrigation shall meet the requirements for waterlogging prevention and control. 5.9.2 The basement, semi-basement and the bottom plate, roof plate and side wall outer wall in contact with the soil shall meet the waterproof and moisture-proof requirements. 5.9.3 When the basement roof is used as an outdoor site, the design shall meet the maximum load requirements for daily use, and the subsequent use load shall not exceed the maximum load requirements for design. 5.9.4 Safety protection facilities should be set up around the top of window wells, air wells and sunken courtyards.

6 Building components and construction

6.1 Roof 6.1.1 The roof shall take measures such as thermal insulation, heat insulation and waterproofing reasonably. Roof waterproofing should be based on the principle of combining drainage and waterproofing, and waterproofing layers should be set at different levels according to the importance and function of the building, combined with engineering characteristics and climatic conditions. 6.1.2 The roof shall meet the following requirements 1 The roof should be set with a slope, and the slope should not be less than 2%; 2 Drainage calculation shall be carried out in the roof design, and the diameter and quantity of gutter, gutter section and rainwater standpipe shall be reasonably determined through calculation; 3 The prefabricated roof should be designed to resist wind exposure, and corresponding fixing measures should be taken for each structural layer 4 Roofs in severe cold and cold areas should take safety measures to prevent ice and snow from falling; 5 For tile roofs with a slope greater than 45°, and tile roofs in areas where strong winds frequently occur or where the seismic fortification intensity is 7 degrees or above, measures should be taken to prevent tile materials from slipping and being blown by wind; 6 The planted roof shall meet the structural requirements of planting load and root puncture resistance; 7 The upper roof should meet the load of personnel activities, and safety protection facilities should be set up in the air space 8 The roof should be convenient for maintenance and inspection, and the roof of large public buildings should be provided with inspection openings or inspection passages. 6.1.3 When glass is used for the lighting roof of a building, laminated glass shall be used on the side facing the interior; when glass is used for the building canopy, laminated glass shall be used. 6.2 Interior and exterior walls 6.2.1 The thickness, material and construction method of the wall should be determined according to its position, function and stress state in the building, and the selection of materials should be based on local conditions. 6.2.2 The outer wall shall adopt measures such as thermal insulation, sound insulation, fire prevention, waterproof, moisture-proof and anti-condensation according to the climatic conditions and building use requirements. 6.2.3 The moisture-proof and waterproof of the wall shall meet the following requirements. 1 For the masonry wall, a continuous horizontal moisture-proof layer should be set above the outdoor ground and at the cushion of the indoor ground. When there is a height difference between the adjacent ground in the room, a moisture-proof layer should be added on the side adjacent to the soil at the height difference; 2 The water-facing surface of indoor walls with moisture-proof requirements should be provided with a moisture-proof layer, and the water-facing surfaces of indoor walls with waterproof requirements should be waterproofed; 3 The walls with water distribution points shall be waterproofed. 6.2.4 Reinforcement measures should be taken at the openings, doors and windows of the external wall to prevent deformation cracks in the wall. Outer window sills shall adopt drainage and waterproof construction measures. 6.2.5 The connection between the internal and external thermal insulation system installed on the wall and the wall, beam and column should be safe and reliable. 6.2.6 The equipment or piping system installed and fixed on the wall shall be safe and reliable, and shall have reliable measures to prevent rainwater and snowwater from leaking into the room. 6.2.7 Protective measures shall be taken and warning signs shall be set up for glass panels installed in parts prone to collisions with human bodies or objects. 6.2.8 The building curtain wall shall comprehensively consider factors such as building category, use function, height, geographical climate and environment of the location, reasonably select the form of curtain wall and panel material, and shall meet the following requirements. 1.It should have the bearing capacity and deformation capacity to withstand the effects of self-weight, wind, earthquake, and temperature, and it should be easy to manufacture, install, maintain, and partially replace panels and other components; 2 It shall meet the performance requirements of watertightness, airtightness, thermal insulation, sound insulation, lighting, impact resistance, fire prevention, lightning protection and other performance requirements of the building; 3 The connection between the curtain wall and the main structure should be firm...

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